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Provocation

From Diablo Wiki

This rune effect increases the chance that Revenge will trigger to 30% from being hit by attacks. This is an odd choice for the highest level rune effect in the skill, since by Hell difficulty all but the most exquisitely-armored Barbarians will be getting hit perpetually during every encounter, which should make 15% more than enough. This this is only useful if a player wants to be constantly able to cast the skill, which isn't out of the question as there is no cooldown.

The following is a very quick summary. See the Revenge rune effects page for a more thorough description of rune effects, or any of the individual rune pages for numbers, screenshots, blue quotes, and much more.